factory wholesale good quality Carbon Steel to Johannesburg Factories
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factory wholesale good quality Carbon Steel to Johannesburg Factories, The product will supply to all over the world, such as: , , ,
Website: https://tj.zzsteel.net/
Email: sales@zzsteel.net
Tianjin Zhan Zhi Investment Corporation Limited founded in 2008. It is a branch of Shanghai Zhanzhi Industry Group Co.,Ltd., it is founded in early 1990s,located in Shanghai Yangpu District, is a large-scale comprehensive enterprise group, combining steel trade, processing and distribution of steel, steel raw materials, real estate development, financial investment and other industries. The registered capital is 200 million RMB.
Classic science demonstration guaranteed to grab your students’ attention! Slide your fingers repeatedly along this 60-cm-long metal rod to create an ear-piercing sound. You control how loud the sound gets — from a whisper to a auditorium-filling shriek. Absolutely incredible! Great experiment to demonstrate the difference between longitudinal and transverse waves.
Available at https://www.teachersource.com/product/singing-rod/sound-waves.
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